Metamorphic Library Chair
The prior post discusses the history of the metamorphic furniture of Morgan and Sanders. Like the Londoners of the early 19th century, I too caught the craze and built a chair that converts into a set of library steps. Having a decent golf book collection extending up to a 9 foot ceiling, I was grabbing the kitchen stool each time to reach the top shelf. Certainly, with the amount of time I spent building the chair, I could have run back and forth to the kitchen over a thousand times. Did I really need to make this gadget? No. But, isn't a Morgan and Sanders style metamorphic library chair more hip than a kitchen stool?
|The chair quickly transforms into a set of steps via hinges located along the top of the front legs.|
In terms of the woodworking itself, the project was an exercise in mortise and tenon joinery. There are close to 40 of these joints, only a few of which were not angled or curved. Some of the mortise and tenons were hand cut completely, others were made with a router jig, some were in combination using power and hand tools. The crest rail was affixed using 1/2" dowels and smaller dowels were used to connect the back splat to the crest rail and rail below. The main lesson learned here is to consider the best timing to cut the joinery. Sometimes, the mortise and tenons should be cut while the stock is still square. Also, some of the curved pieces have flat sections to make the joinery simpler. For example, the back leg has a flat section at the level of the side rail as well as at the level of the arm rest. Similarly, there is a flat plateau along the top of the side rail to accept the support for the armrest support.
|Flat sections on curved pieces simplifies the joinery.|
|Plywood template in the "chair" position.|
Mimicking the side profile when the chair back is flipped for the stairs. The armrests needed to be shortened so that they would not hit the leg when the steps are used.
|OK. I don't own a table saw. I am not recommending the use of your garage door rails as a hoist.|
This template jig prevented the blade from wandering too far off course. This type of jig has been described in the various woodworking magazines.
|Following the rough cutting with the band saw, the pieces were cleaned up with a spokeshave and then sanded.|
I went with angled mortises rather than angled tenons. You can look at other sites about that debate. Sometimes the tenons were cut freehand, other times I used my Stanley 55 saw plane.
Note the difference after fixing things up a bit..
The central axis of the hinges are now colinear with the rear of the front seat rail.
|Note that the side rail is not shaped until the mortise and tenons are completed.|
|Chair swung open in "steps" mode.|
|A router jig to create the mortise and tenons was used for many of the smaller pieces that support the treads of the steps.|
|Stair treads made of maple|
|I finally got to use my coach-makers router to fashion the grooves for the panel.|
|At this point, I had not glued anything in place.|
This shows the mortise for the hinge. Since screws go into end grain, dowels were placed just deep to the mortise so that the screw can have more grab. The second screw goes through a tenon.
The "emblem" is a standardized 1" golf ball marker recessed flush to the surface with a magnetic backing which can be easily exchanged.
|Maple steps with diamond inlay.|
|Note the 5th leg added under the center stretcher.|
|Ackermann's Repository , July 1811|